From owner-freebsd-questions@FreeBSD.ORG Sat Feb 16 18:43:20 2008 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 467DB16A417 for ; Sat, 16 Feb 2008 18:43:20 +0000 (UTC) (envelope-from erikt@midgard.homeip.net) Received: from ch-smtp02.sth.basefarm.net (ch-smtp02.sth.basefarm.net [80.76.149.213]) by mx1.freebsd.org (Postfix) with ESMTP id EC9DE13C46B for ; Sat, 16 Feb 2008 18:43:19 +0000 (UTC) (envelope-from erikt@midgard.homeip.net) Received: from c83-253-25-183.bredband.comhem.se ([83.253.25.183]:57591 helo=falcon.midgard.homeip.net) by ch-smtp02.sth.basefarm.net with esmtp (Exim 4.68) (envelope-from ) id 1JQS0M-0000BS-9R for freebsd-questions@freebsd.org; Sat, 16 Feb 2008 19:43:19 +0100 Received: (qmail 3457 invoked from network); 16 Feb 2008 19:43:13 +0100 Received: from owl.midgard.homeip.net (10.1.5.7) by falcon.midgard.homeip.net with ESMTP; 16 Feb 2008 19:43:13 +0100 Received: (qmail 54541 invoked by uid 1001); 16 Feb 2008 19:43:13 +0100 Date: Sat, 16 Feb 2008 19:43:13 +0100 From: Erik Trulsson To: Peter Boosten Message-ID: <20080216184313.GA54521@owl.midgard.homeip.net> Mail-Followup-To: Peter Boosten , "Brian A. Seklecki" , FreeBSD Questions References: <47B71686.7000906@boosten.org> <1203182898.3213.2.camel@new-host.l33tsdal3.biz> <47B72BCD.9080001@boosten.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <47B72BCD.9080001@boosten.org> User-Agent: Mutt/1.5.17 (2007-11-01) X-Originating-IP: 83.253.25.183 X-Scan-Result: No virus found in message 1JQS0M-0000BS-9R. X-Scan-Signature: ch-smtp02.sth.basefarm.net 1JQS0M-0000BS-9R 35c6ce5fa1e376b78c149d181ab6b49a Cc: "Brian A. Seklecki" , FreeBSD Questions Subject: Re: disk error X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 16 Feb 2008 18:43:20 -0000 On Sat, Feb 16, 2008 at 07:30:37PM +0100, Peter Boosten wrote: > Brian A. Seklecki wrote: >> On Sat, 2008-02-16 at 17:59 +0100, Peter Boosten wrote: >>> Hi all, >>> >>> Just found these messages in my logfile. Is it something to worry about? >>> I've never seen them before upgrading to 6.3. >>> >>> ra kernel: ad0: TIMEOUT - READ_DMA48 retrying (1 retry left) LBA=281550271 >>> ra kernel: ad0: FAILURE - READ_DMA48 status=51 >>> error=4 LBA=281550271 >> >> Yea -- normally that means a bad sector(*), and where there's one, >> there's bound to be more. Failed drive eventually. >> >> I would pull this server from rotation and run a full surface sector >> scan on it (download an ISO of "Hiran's Boot CD") >> > > Brian, thanks for your answer (and sugggestion). > > Isn't a drive supposed to mark a bad sector as bad and ignore it (that is: > not use it anymore)? The drive can only remap bad sectors when you write to them. When you read from a bad sector the drive does not know what data was supposed to be there and thus can only return an error or return garbage data. Returning an error (which is what disks do) is a much better choice. -- Erik Trulsson ertr1013@student.uu.se